public void MoveChannels(IList <ChannelInfo> channels, bool up)
{
if (channels.Count == 0)
{
return;
}
if (up && channels[0].GetPosition(this.SubListIndex) <= this.ChannelList.FirstProgramNumber)
{
return;
}
int delta = (up ? -1 : +1);
foreach (var channel in (up ? channels : channels.Reverse()))
{
int newProgramNr = channel.GetPosition(this.SubListIndex) + delta;
ChannelInfo channelAtNewPos =
this.ChannelList.Channels.FirstOrDefault(ch => ch.GetPosition(this.SubListIndex) == newProgramNr);
if (channelAtNewPos != null)
{
channelAtNewPos.ChangePosition(this.SubListIndex, -delta);
}
channel.ChangePosition(this.SubListIndex, delta);
}
this.DataRoot.NeedsSaving = true;
}
